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Berserker's True Name is Caligula (カリギュラ,Karigyura?), the third emperor of the Ancient Roman Empire and uncle of the later emperor, Nero. Ruling during the 1st century, Caligula was a beloved, wise ruler, but his later actions gave rise to legends of atrocity. He suddenly "became loved by the moon", having fallen into madness. He then ruled the empire through fear until his assassination a few years later.[1]

Berserker is a total sadist engrossed in sadism, seeking to perform atrocities and misdeeds upon all enemies who catch his eye. He is completely unmanageable due to Mad Enhancement, removing any means of self-restraint. Berserker possesses a fondness for both Roma and Nero even in his maddened state, allowing contact with either of them to possibly stop his rampages.[1] His wish to the Holy Grail is "to get rid of his madness". If it could be granted, he would wish to return to that time when he was called a wise king, when he told stories to the child of his little sister, Nero, sitting on his lap... To that time, before the Moon Goddess fell in love with him and filled his body with madness.

Although extremely close in nature to an Anti-Hero, he has manifested as a Heroic Spirit for an unknown reason. It could either be a "prank from a Divine Spirit that presides over the moon", or possibly the potential demise of human history raising the mentality from the period where he was called a wise ruler, the reason that exists in the shadows of madness.[1]

Berserker fights primarily with his fists. His Mad Enhancement increases his parameters by one rank at the cost of his reason, but it is possible for Nero or Romulus to quell his rampages after a successful Luck Check. His Noble Phantasm is Flucticulus Diana.

Profile
Possessing legends of atrocity, the Third Emperor of the Ancient Roman Empire.
An individual from the 1st Century. Uncle of Emperor Nero.
At first he was loved by the people as a wise ruler, all of a sudden he became loved by the moon - falling into madness.
In the few years until his assassination, he ruled the Empire through fear.

Level 2 Bond
A complete sadist who likes sadism.
All enemies that catch his eye become targets of atrocities and misdeeds.
Furthermore, having fell into a state in which self-restrain is ineffective due to the Skill Mad Enhancement, he is unmanageable.
--but even in this state, he likes Roma. He also likes Nero.

Level 3 Bond

Mad Enhancement: A+

All stats receive a Rank-UP, but the majority of reason ended up being robbed away.
In case he gets in contact with Nero or Roma, a LCK check is performed. If successful, his rampage is put to a stop.

Level 5 Bond
A Noble Phantasm that sublimated the legends in which the expression of his madness is the affection and divine protection of the Moon Goddess Diana (corresponding to Artemis of the Olympian Gods).
If employed against an entire army, a repulsive and miserable situation will probably occur.

Interlude
Despite being an existence extremely close to a anti-hero, the reason why he manifested in this world as a Heroic Spirit is unknown. Maybe it was a prank from a Divine Spirit that presides over the moon; or maybe the reason that exist in the shadows of madness, the mentality from when he was once called a wise ruler, cheered up when facing with the demise of human history--